Shingle and linoleum knife



Sept.'6, 1932. R. J. TOBIN SHINGLE AND LINOLEUM KNIFE Filed July 12.1930 WIIIIIIIIIIIIII INVENTOR Robe/fr! Tobin.

ATTORNEYS Patented Sept. 6, 1932 ane ia rosin-or HoLLIs NnwYoRK V I,.-"sirr retnnnnmivonnnm KNIFE "Application filed .Tu1y"- 12,

The invention relates intgeneral to cutting instruments, and morepart-icularlyto a knife for cutting or trimming composition shingles orthe like. H

in object of the:inventionisitoprovide a knife which is of aproper andconvenient shape for cutting and' trimming composition shingles. v o, f

Another object of the invention'is toprovidea knife having a separablebladejwhich is reversible so that one'endzcan-be pointed when the otherend has become ;dull, ,the blade being preferably crescent. shaped tofacilitate trimming and cutting the shingles.

Another object of the invention is to provide a knife having separableblade with vprovision for protecting the .user from the end ofthebladenot'in'use." g I Another object of the invention is to ;,provide'a.knife of the above kind Which-is safe and convenient to use, simpleandinexpensive to make andrugged and efl'ectiveinconstruc- 'tion.. x :1

These and other objects will beapparent from. the following descriptionandscl'aims when considered withuthe accompanying drawing, in which i 1I Fig. 1 is.a side elevation o'fone'form of knife according totheinvention; v

Fig. 2 is a fragmentary end view'looking inthe directionof'the line2-2in Fig.1.;

Fig.3 is a sectiononthe-line 3. -3 of Fig. 1,; Fig. 4 is a sideelevation of a modified form ofknife; Fig. 5 is a section on the line"55 of'Fig. 1 Fig. 6 is a side elevation-of another modified formofknife; and: J J h Fig. 7 is a section onrthe line 7-7-of F ig; 6. Inthe following '1 description and -.in' the claims parts will be Iidentified by specific '=names for convenience, but they are intended tobe as generic in their applicationtosimila-r parts as the art willpermit. l

Like reference characters denote like parts in the several figures ofthe drawing.

In the drawing accompanying and forming partof this specificatlon,;pract1cal. commercial embodimentsof the inventionare shown,

but as such illustrations are primarily .for purposes of disolosure, itwill'be understood that the knife can easily be" 1930. Serial No.467,451.

that-the structure may be modifiedin" various respects withoutdeparture'from the broad spirit andfscop e ofthe invention ashereinafte'r defined andgclaimed.

Referring now to the drawing, a'ndmore particularly to Figs. 1, 2 and 3,the knife com} prise-s in I general a handle 10, blade holder '11: and ablade 12.. The-blade holderill. has side-Walls 14 and'15jj0ined byacurvedlback Wall 16, the side. wall 14 having an extension or-tang 13passing into-the body of the holder 10, through ametal collar orferrule22.

Itwill be understood that the'holde'r ll may conveniently: be made from:sheet ;metal bent or distorted to shape by-a suitablej die. -It -Willbe understood that'the tang 1-3 is fastened *tothe handle 12in anyapproved manneig the fastening elementg21 being passed-through thehandle and the tang 13 to assist in iholding thesemembers together.

- Disposed'within'the recess inthe holderll, formedby Walls 14, 15 and16, is the knife blade 12. Theblade 1 2 is preferably crescent V shapedas indicated, having -a,-convexfback edge 18 which is preferably blunt,and' a concave cutting edge 17 which is -preferably sharp all the wayfrom the point lgt the PI T o 1 ,1;

At apart of the blade '12, -midway,the point-s19 and 20, a hole-isprovided through 4 which is passed the fastening screw23 which .ispreferably threaded into the wall 14 to rigidly hold the knifefbladeinlthehdlder. Itwill-be noted that the blunt edge 18 snu'g ly fltsthe curved wall 16 so that any rotary movement of the bladeabout thefastening element .23 is .prevented. "Furthermore, it

will; be seen that the-parts'of thewallsH and .15. Which extend beyondthe unusedrpart of the cutting edge '17 act to .protectthe' user fromthe-unusedcutting edge. Thus it will b eseen that the mflyparrtr theknife blade exposedisthepart it i'sdesi'red to use. The points 19-and Oare 'sharp so thrust into the y of fihil g e at anypoint'and'the shingletrimmed or cut to fit the roof or other surface to whiclrit is applied.Furthermore-the en the extent ofthe cutting edge '17 is'available foruse all the way from the exposedopoint 19 to the edge of the Walls 14and 15. When the exposed part of the edge 17 and point 19 becomes dulledor nicked through use, it is only necessary to take out the screw 23, reverse the blade and replace the screw 23.

If desired, the knife may take the form illustrated in Figs. 4 and 5. Inthis construction the handle is secured to the tang 33 which passesthrough the ferrule 44 in any desired manner, but preferably in a mannersimilar to that described above.

The blade holder 31 comprises a side wall 34 having a curved back wall"36 and a stampled up tongue 35. The blade 32 has a convex, blunt backedge 42 and a curved front edge which, if desired, may be made up of theconcave portions 37 and 38 which are sharp. The concave edges 37 and 38intersect at point 39 and terminate in sharp cutting points 40 and 41.The screw 43 is provided for detachabl-y connecting the holder andblade.

The use of the knife shown in Figs. 4 and 5 is similar to that describedabove. The close fit of the unused part of the cutting edge indicated by38 in the drawing, together with the position of the tongue 35 and theposition of the point 41 atthe end of the holder or handle 30 serves tofurther protect the user from the unused p art of the cutting edge. Itwill be understood that the blade 32 is reversible in this constructionin the same manner as explained above and that the blade 32 is rigidlyand immovably secured to the holder by a screw 43 and the close fit ofthe curved wall 36 and the back edge 42 of the blade. It will also beunderstood that, if desired the blade of Fig. 4 may be used with theholder of Fig. 1 and similarly the blade of Fig. 1 may be used with theholder of Fig. 4.

Referring now to Figs. 6 and 7 a knife having a straight edged blade isshown. This knife comprises a holder 50, a handle 51 and a reversibleblade 52. The holder comprises a back wall 53 and side walls 54 broughtcloser together at 55.

The blade 52 comprises end cutting portions 56 with an intermediatefastening portion 57, a screw 58 being passed through fastening portion57 and the back wall 53 to hold the parts assembled.

The straight side edges 59 of the portions .56 may be sharp for cuttingand, if desired,

the end edges 60 may also be sharp for cutting or they may be blunt; ineither case the intersections of the edges 59 and 60 may be sharp forthrusting in the body of a composition shingle or of linoleum.

It will be noted that the edges 59 and 60 which are not in use arespaced from the holder 50 so thatthey are protected and kept sharp. Atthe same time the position of the unused end of the blade in the holderis such I that the user is protected from being accidentally cut by theunused part of the blade.

It will be understood that the holder 50 has a tang 61 extending intothe body of the handle 51 and secured thereto in any desired manner. Theuse of the knife will be obvious from the above description to thoseskilled in the art.

Thus knives have been provided which are most convenient for cuttingshingles of composition material and the like. It will fit easily intosmall places and can be used effectively to trim a shingle or othersimilar article to any desired curve or shape. Furthermore, the devicesare insured of long life because, when one part of the blade becomesdull, it can be reversed and the other part used. In addition, theknives are safe to use and the user is not liable to get accidentallycut from the parts of the blade which are not in use at the time.

While certain novel features of the invention have been shown anddescribed and are pointed out in the annexed claims, it will beunderstood that various omissions, substitutions and changes may be madeby those skilled in the art without departing from the spirit of theinvention.

What is claimed is:

1. In a knife for cutting shinglesand the like, a handle, a holdercomprising a single side wall and a convex back wall forming a seat,said side wall having a part secured to said handle, a substantiallycrescent-shaped blade having a convex back edge and a concave cuttingedge, said edges terminating at their remote ends in sharp points, saidblade reversibly fitting in said seat with its back edge abutting theback wall of said holder a removable fastening element threading saidside wall and a part of said blade midway said sharp points, and aprojection on said side wall close to but spaced from the unused part ofthe cutting edge to protect the user therefrom, said blade beingremovable from said holder in a direction perpendicular to the plane ofthe blade.

2. In a cutting knife, the combination of a crescent-shaped reversibleblade with the inner edge of the crescent forming the cutting edge, aplate member for receiving and holding said blade, 1 means for attachingsaid blade to said plate member, an upstanding curved wall member formedon the back edge of said plate member for engaging the curved back edgeof said blade to hold it from moving relatively to said plate memberduring cutting operations, an upstanding tongue on said plate memberadjacent the cutting edge of said blade to protect the user, and ahandle secured to said plate member.

3. In a knife for cutting shingles and the like, a handle, a holdercomprising a side wall and a convex back wall forming a seat, said sidewall having a part securedto said handle, a substantiallycrescent-shaped blade havinga convex back edge and separate adjoiningconcave cutting edges whose remote ends terminate in sharp points, saidcutting edges meeting at a central point midway between the ends of theblade, said blade reversibly fitting in said seat with its backedgeabutting the back wall of said holder, a removable fastening elementthreading said side wall and the central part of said blade, and meansfor protecting the user from the unused part of the blade whereby theused part of said blade projects from said holder and the unused part ofsaid blade is disposed alongside said side walls with its point adjacentsaid handle, said blade being'removable from said holder bodily in adirection substantially transverse to the length of the blade.

Intestimony whereof I have hereunto set my hand.

ROBERT J. TOBIN. 30 i

